Another possible reason is a sense of not belonging. Maybe she is different from the rest of her family in terms of beliefs or interests, and she runs away to find a place where she can be herself without judgment.
Perhaps he was influenced by some new friends he met who had a different lifestyle or view of the world. They might have convinced him that running away from home was an exciting adventure and a way to break free from the restrictions at home.
It could also be due to a particularly bad encounter with someone in the village. For instance, if he was bullied severely by some older kids and he felt that there was no one to protect him. He might have thought that running away was his only option to avoid further harm.
Mal might run away in the fanfiction because she's constantly being judged for her past as a villain's daughter. Despite her efforts to fit in Auradon, there are still those who look at her with suspicion. She could also be running away from a future that she doesn't want. For example, if there are plans for her to take on a role she's not ready for or doesn't believe in, she may choose to escape.
One reason could be bullying. If a student is constantly bullied at school, they might run away to escape the torment. Another reason could be academic pressure. Struggling with too many difficult subjects or high expectations can make a student feel overwhelmed and want to run. Also, family problems like parents' divorce or constant arguing at home can spill over and make the school environment seem unbearable, leading to running away.
One example could be a story where the girl runs away due to family arguments. She might find solace in a new town, make new friends who help her understand her own worth outside of her family's expectations.
One possible reason could be Naruto's internal conflict. In yaoi fanfiction, the relationship is often complex. Naruto might be running away because he's confused about his feelings for Sasuke. He may not be ready to face the intensity of the relationship that the yaoi concept implies.
One possible reason is she's had an argument with her friends and feels she needs to get away to cool off.
Another reason could be that Harry in the fanfic has a newfound sense of self - worth. He realizes he doesn't deserve the horrible treatment from the Dursleys and decides to break free. He may have learned about his true heritage in a different way in the fanfic and decides to leave behind the Dursleys, who have always tried to suppress his wizarding identity.
Maybe he's tired of his restricted life. In the story, he might be feeling suffocated by all the rules and expectations placed on him, so he decides to run away to find freedom.
Perhaps in fanfiction, Harry runs away from the Dursleys because he discovers a new threat that the Dursleys won't protect him from. He realizes that he has to take matters into his own hands and leaving is the only option. Also, he could be running away because he has made some new friends in the wizarding world who offer him a better alternative to living with the Dursleys.